1 /******************************************************************************* 2 * Filename: target_core_pscsi.c 3 * 4 * This file contains the generic target mode <-> Linux SCSI subsystem plugin. 5 * 6 * (c) Copyright 2003-2013 Datera, Inc. 7 * 8 * Nicholas A. Bellinger <nab@kernel.org> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23 * 24 ******************************************************************************/ 25 26 #include <linux/string.h> 27 #include <linux/parser.h> 28 #include <linux/timer.h> 29 #include <linux/blkdev.h> 30 #include <linux/blk_types.h> 31 #include <linux/slab.h> 32 #include <linux/spinlock.h> 33 #include <linux/genhd.h> 34 #include <linux/cdrom.h> 35 #include <linux/ratelimit.h> 36 #include <linux/module.h> 37 #include <asm/unaligned.h> 38 39 #include <scsi/scsi_device.h> 40 #include <scsi/scsi_host.h> 41 #include <scsi/scsi_tcq.h> 42 43 #include <target/target_core_base.h> 44 #include <target/target_core_backend.h> 45 46 #include "target_core_alua.h" 47 #include "target_core_internal.h" 48 #include "target_core_pscsi.h" 49 50 #define ISPRINT(a) ((a >= ' ') && (a <= '~')) 51 52 static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev) 53 { 54 return container_of(dev, struct pscsi_dev_virt, dev); 55 } 56 57 static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd); 58 static void pscsi_req_done(struct request *, int); 59 60 /* pscsi_attach_hba(): 61 * 62 * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host. 63 * from the passed SCSI Host ID. 64 */ 65 static int pscsi_attach_hba(struct se_hba *hba, u32 host_id) 66 { 67 struct pscsi_hba_virt *phv; 68 69 phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL); 70 if (!phv) { 71 pr_err("Unable to allocate struct pscsi_hba_virt\n"); 72 return -ENOMEM; 73 } 74 phv->phv_host_id = host_id; 75 phv->phv_mode = PHV_VIRTUAL_HOST_ID; 76 77 hba->hba_ptr = phv; 78 79 pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on" 80 " Generic Target Core Stack %s\n", hba->hba_id, 81 PSCSI_VERSION, TARGET_CORE_VERSION); 82 pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n", 83 hba->hba_id); 84 85 return 0; 86 } 87 88 static void pscsi_detach_hba(struct se_hba *hba) 89 { 90 struct pscsi_hba_virt *phv = hba->hba_ptr; 91 struct Scsi_Host *scsi_host = phv->phv_lld_host; 92 93 if (scsi_host) { 94 scsi_host_put(scsi_host); 95 96 pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from" 97 " Generic Target Core\n", hba->hba_id, 98 (scsi_host->hostt->name) ? (scsi_host->hostt->name) : 99 "Unknown"); 100 } else 101 pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA" 102 " from Generic Target Core\n", hba->hba_id); 103 104 kfree(phv); 105 hba->hba_ptr = NULL; 106 } 107 108 static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag) 109 { 110 struct pscsi_hba_virt *phv = hba->hba_ptr; 111 struct Scsi_Host *sh = phv->phv_lld_host; 112 /* 113 * Release the struct Scsi_Host 114 */ 115 if (!mode_flag) { 116 if (!sh) 117 return 0; 118 119 phv->phv_lld_host = NULL; 120 phv->phv_mode = PHV_VIRTUAL_HOST_ID; 121 122 pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough" 123 " %s\n", hba->hba_id, (sh->hostt->name) ? 124 (sh->hostt->name) : "Unknown"); 125 126 scsi_host_put(sh); 127 return 0; 128 } 129 /* 130 * Otherwise, locate struct Scsi_Host from the original passed 131 * pSCSI Host ID and enable for phba mode 132 */ 133 sh = scsi_host_lookup(phv->phv_host_id); 134 if (!sh) { 135 pr_err("pSCSI: Unable to locate SCSI Host for" 136 " phv_host_id: %d\n", phv->phv_host_id); 137 return -EINVAL; 138 } 139 140 phv->phv_lld_host = sh; 141 phv->phv_mode = PHV_LLD_SCSI_HOST_NO; 142 143 pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n", 144 hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown"); 145 146 return 1; 147 } 148 149 static void pscsi_tape_read_blocksize(struct se_device *dev, 150 struct scsi_device *sdev) 151 { 152 unsigned char cdb[MAX_COMMAND_SIZE], *buf; 153 int ret; 154 155 buf = kzalloc(12, GFP_KERNEL); 156 if (!buf) 157 return; 158 159 memset(cdb, 0, MAX_COMMAND_SIZE); 160 cdb[0] = MODE_SENSE; 161 cdb[4] = 0x0c; /* 12 bytes */ 162 163 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL, 164 HZ, 1, NULL); 165 if (ret) 166 goto out_free; 167 168 /* 169 * If MODE_SENSE still returns zero, set the default value to 1024. 170 */ 171 sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]); 172 if (!sdev->sector_size) 173 sdev->sector_size = 1024; 174 out_free: 175 kfree(buf); 176 } 177 178 static void 179 pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn) 180 { 181 unsigned char *buf; 182 183 if (sdev->inquiry_len < INQUIRY_LEN) 184 return; 185 186 buf = sdev->inquiry; 187 if (!buf) 188 return; 189 /* 190 * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev() 191 */ 192 memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor)); 193 memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model)); 194 memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision)); 195 } 196 197 static int 198 pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn) 199 { 200 unsigned char cdb[MAX_COMMAND_SIZE], *buf; 201 int ret; 202 203 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); 204 if (!buf) 205 return -ENOMEM; 206 207 memset(cdb, 0, MAX_COMMAND_SIZE); 208 cdb[0] = INQUIRY; 209 cdb[1] = 0x01; /* Query VPD */ 210 cdb[2] = 0x80; /* Unit Serial Number */ 211 cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff; 212 cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff); 213 214 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 215 INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL); 216 if (ret) 217 goto out_free; 218 219 snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]); 220 221 wwn->t10_dev->dev_flags |= DF_FIRMWARE_VPD_UNIT_SERIAL; 222 223 kfree(buf); 224 return 0; 225 226 out_free: 227 kfree(buf); 228 return -EPERM; 229 } 230 231 static void 232 pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev, 233 struct t10_wwn *wwn) 234 { 235 unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83; 236 int ident_len, page_len, off = 4, ret; 237 struct t10_vpd *vpd; 238 239 buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL); 240 if (!buf) 241 return; 242 243 memset(cdb, 0, MAX_COMMAND_SIZE); 244 cdb[0] = INQUIRY; 245 cdb[1] = 0x01; /* Query VPD */ 246 cdb[2] = 0x83; /* Device Identifier */ 247 cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff; 248 cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff); 249 250 ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 251 INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, 252 NULL, HZ, 1, NULL); 253 if (ret) 254 goto out; 255 256 page_len = (buf[2] << 8) | buf[3]; 257 while (page_len > 0) { 258 /* Grab a pointer to the Identification descriptor */ 259 page_83 = &buf[off]; 260 ident_len = page_83[3]; 261 if (!ident_len) { 262 pr_err("page_83[3]: identifier" 263 " length zero!\n"); 264 break; 265 } 266 pr_debug("T10 VPD Identifier Length: %d\n", ident_len); 267 268 vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL); 269 if (!vpd) { 270 pr_err("Unable to allocate memory for" 271 " struct t10_vpd\n"); 272 goto out; 273 } 274 INIT_LIST_HEAD(&vpd->vpd_list); 275 276 transport_set_vpd_proto_id(vpd, page_83); 277 transport_set_vpd_assoc(vpd, page_83); 278 279 if (transport_set_vpd_ident_type(vpd, page_83) < 0) { 280 off += (ident_len + 4); 281 page_len -= (ident_len + 4); 282 kfree(vpd); 283 continue; 284 } 285 if (transport_set_vpd_ident(vpd, page_83) < 0) { 286 off += (ident_len + 4); 287 page_len -= (ident_len + 4); 288 kfree(vpd); 289 continue; 290 } 291 292 list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list); 293 off += (ident_len + 4); 294 page_len -= (ident_len + 4); 295 } 296 297 out: 298 kfree(buf); 299 } 300 301 static int pscsi_add_device_to_list(struct se_device *dev, 302 struct scsi_device *sd) 303 { 304 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 305 struct request_queue *q = sd->request_queue; 306 307 pdv->pdv_sd = sd; 308 309 if (!sd->queue_depth) { 310 sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH; 311 312 pr_err("Set broken SCSI Device %d:%d:%llu" 313 " queue_depth to %d\n", sd->channel, sd->id, 314 sd->lun, sd->queue_depth); 315 } 316 317 dev->dev_attrib.hw_block_size = sd->sector_size; 318 dev->dev_attrib.hw_max_sectors = 319 min_t(int, sd->host->max_sectors, queue_max_hw_sectors(q)); 320 dev->dev_attrib.hw_queue_depth = sd->queue_depth; 321 322 /* 323 * Setup our standard INQUIRY info into se_dev->t10_wwn 324 */ 325 pscsi_set_inquiry_info(sd, &dev->t10_wwn); 326 327 /* 328 * Locate VPD WWN Information used for various purposes within 329 * the Storage Engine. 330 */ 331 if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) { 332 /* 333 * If VPD Unit Serial returned GOOD status, try 334 * VPD Device Identification page (0x83). 335 */ 336 pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn); 337 } 338 339 /* 340 * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE. 341 */ 342 if (sd->type == TYPE_TAPE) 343 pscsi_tape_read_blocksize(dev, sd); 344 return 0; 345 } 346 347 static struct se_device *pscsi_alloc_device(struct se_hba *hba, 348 const char *name) 349 { 350 struct pscsi_dev_virt *pdv; 351 352 pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL); 353 if (!pdv) { 354 pr_err("Unable to allocate memory for struct pscsi_dev_virt\n"); 355 return NULL; 356 } 357 358 pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name); 359 return &pdv->dev; 360 } 361 362 /* 363 * Called with struct Scsi_Host->host_lock called. 364 */ 365 static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd) 366 __releases(sh->host_lock) 367 { 368 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 369 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 370 struct Scsi_Host *sh = sd->host; 371 struct block_device *bd; 372 int ret; 373 374 if (scsi_device_get(sd)) { 375 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n", 376 sh->host_no, sd->channel, sd->id, sd->lun); 377 spin_unlock_irq(sh->host_lock); 378 return -EIO; 379 } 380 spin_unlock_irq(sh->host_lock); 381 /* 382 * Claim exclusive struct block_device access to struct scsi_device 383 * for TYPE_DISK using supplied udev_path 384 */ 385 bd = blkdev_get_by_path(dev->udev_path, 386 FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv); 387 if (IS_ERR(bd)) { 388 pr_err("pSCSI: blkdev_get_by_path() failed\n"); 389 scsi_device_put(sd); 390 return PTR_ERR(bd); 391 } 392 pdv->pdv_bd = bd; 393 394 ret = pscsi_add_device_to_list(dev, sd); 395 if (ret) { 396 blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL); 397 scsi_device_put(sd); 398 return ret; 399 } 400 401 pr_debug("CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%llu\n", 402 phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun); 403 return 0; 404 } 405 406 /* 407 * Called with struct Scsi_Host->host_lock called. 408 */ 409 static int pscsi_create_type_rom(struct se_device *dev, struct scsi_device *sd) 410 __releases(sh->host_lock) 411 { 412 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 413 struct Scsi_Host *sh = sd->host; 414 int ret; 415 416 if (scsi_device_get(sd)) { 417 pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n", 418 sh->host_no, sd->channel, sd->id, sd->lun); 419 spin_unlock_irq(sh->host_lock); 420 return -EIO; 421 } 422 spin_unlock_irq(sh->host_lock); 423 424 ret = pscsi_add_device_to_list(dev, sd); 425 if (ret) { 426 scsi_device_put(sd); 427 return ret; 428 } 429 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n", 430 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, 431 sd->channel, sd->id, sd->lun); 432 433 return 0; 434 } 435 436 /* 437 * Called with struct Scsi_Host->host_lock called. 438 */ 439 static int pscsi_create_type_other(struct se_device *dev, 440 struct scsi_device *sd) 441 __releases(sh->host_lock) 442 { 443 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 444 struct Scsi_Host *sh = sd->host; 445 int ret; 446 447 spin_unlock_irq(sh->host_lock); 448 ret = pscsi_add_device_to_list(dev, sd); 449 if (ret) 450 return ret; 451 452 pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n", 453 phv->phv_host_id, scsi_device_type(sd->type), sh->host_no, 454 sd->channel, sd->id, sd->lun); 455 return 0; 456 } 457 458 static int pscsi_configure_device(struct se_device *dev) 459 { 460 struct se_hba *hba = dev->se_hba; 461 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 462 struct scsi_device *sd; 463 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 464 struct Scsi_Host *sh = phv->phv_lld_host; 465 int legacy_mode_enable = 0; 466 int ret; 467 468 if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) || 469 !(pdv->pdv_flags & PDF_HAS_TARGET_ID) || 470 !(pdv->pdv_flags & PDF_HAS_LUN_ID)) { 471 pr_err("Missing scsi_channel_id=, scsi_target_id= and" 472 " scsi_lun_id= parameters\n"); 473 return -EINVAL; 474 } 475 476 /* 477 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the 478 * struct Scsi_Host we will need to bring the TCM/pSCSI object online 479 */ 480 if (!sh) { 481 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { 482 pr_err("pSCSI: Unable to locate struct" 483 " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n"); 484 return -ENODEV; 485 } 486 /* 487 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device 488 * reference, we enforce that udev_path has been set 489 */ 490 if (!(dev->dev_flags & DF_USING_UDEV_PATH)) { 491 pr_err("pSCSI: udev_path attribute has not" 492 " been set before ENABLE=1\n"); 493 return -EINVAL; 494 } 495 /* 496 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID, 497 * use the original TCM hba ID to reference Linux/SCSI Host No 498 * and enable for PHV_LLD_SCSI_HOST_NO mode. 499 */ 500 if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) { 501 if (hba->dev_count) { 502 pr_err("pSCSI: Unable to set hba_mode" 503 " with active devices\n"); 504 return -EEXIST; 505 } 506 507 if (pscsi_pmode_enable_hba(hba, 1) != 1) 508 return -ENODEV; 509 510 legacy_mode_enable = 1; 511 hba->hba_flags |= HBA_FLAGS_PSCSI_MODE; 512 sh = phv->phv_lld_host; 513 } else { 514 sh = scsi_host_lookup(pdv->pdv_host_id); 515 if (!sh) { 516 pr_err("pSCSI: Unable to locate" 517 " pdv_host_id: %d\n", pdv->pdv_host_id); 518 return -EINVAL; 519 } 520 pdv->pdv_lld_host = sh; 521 } 522 } else { 523 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) { 524 pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while" 525 " struct Scsi_Host exists\n"); 526 return -EEXIST; 527 } 528 } 529 530 spin_lock_irq(sh->host_lock); 531 list_for_each_entry(sd, &sh->__devices, siblings) { 532 if ((pdv->pdv_channel_id != sd->channel) || 533 (pdv->pdv_target_id != sd->id) || 534 (pdv->pdv_lun_id != sd->lun)) 535 continue; 536 /* 537 * Functions will release the held struct scsi_host->host_lock 538 * before calling calling pscsi_add_device_to_list() to register 539 * struct scsi_device with target_core_mod. 540 */ 541 switch (sd->type) { 542 case TYPE_DISK: 543 ret = pscsi_create_type_disk(dev, sd); 544 break; 545 case TYPE_ROM: 546 ret = pscsi_create_type_rom(dev, sd); 547 break; 548 default: 549 ret = pscsi_create_type_other(dev, sd); 550 break; 551 } 552 553 if (ret) { 554 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) 555 scsi_host_put(sh); 556 else if (legacy_mode_enable) { 557 pscsi_pmode_enable_hba(hba, 0); 558 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; 559 } 560 pdv->pdv_sd = NULL; 561 return ret; 562 } 563 return 0; 564 } 565 spin_unlock_irq(sh->host_lock); 566 567 pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no, 568 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id); 569 570 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) 571 scsi_host_put(sh); 572 else if (legacy_mode_enable) { 573 pscsi_pmode_enable_hba(hba, 0); 574 hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE; 575 } 576 577 return -ENODEV; 578 } 579 580 static void pscsi_dev_call_rcu(struct rcu_head *p) 581 { 582 struct se_device *dev = container_of(p, struct se_device, rcu_head); 583 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 584 585 kfree(pdv); 586 } 587 588 static void pscsi_free_device(struct se_device *dev) 589 { 590 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 591 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 592 struct scsi_device *sd = pdv->pdv_sd; 593 594 if (sd) { 595 /* 596 * Release exclusive pSCSI internal struct block_device claim for 597 * struct scsi_device with TYPE_DISK from pscsi_create_type_disk() 598 */ 599 if ((sd->type == TYPE_DISK) && pdv->pdv_bd) { 600 blkdev_put(pdv->pdv_bd, 601 FMODE_WRITE|FMODE_READ|FMODE_EXCL); 602 pdv->pdv_bd = NULL; 603 } 604 /* 605 * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference 606 * to struct Scsi_Host now. 607 */ 608 if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) && 609 (phv->phv_lld_host != NULL)) 610 scsi_host_put(phv->phv_lld_host); 611 else if (pdv->pdv_lld_host) 612 scsi_host_put(pdv->pdv_lld_host); 613 614 if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM)) 615 scsi_device_put(sd); 616 617 pdv->pdv_sd = NULL; 618 } 619 call_rcu(&dev->rcu_head, pscsi_dev_call_rcu); 620 } 621 622 static void pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg, 623 unsigned char *sense_buffer) 624 { 625 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); 626 struct scsi_device *sd = pdv->pdv_sd; 627 int result; 628 struct pscsi_plugin_task *pt = cmd->priv; 629 unsigned char *cdb; 630 /* 631 * Special case for REPORT_LUNs handling where pscsi_plugin_task has 632 * not been allocated because TCM is handling the emulation directly. 633 */ 634 if (!pt) 635 return; 636 637 cdb = &pt->pscsi_cdb[0]; 638 result = pt->pscsi_result; 639 /* 640 * Hack to make sure that Write-Protect modepage is set if R/O mode is 641 * forced. 642 */ 643 if (!cmd->data_length) 644 goto after_mode_sense; 645 646 if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) && 647 (status_byte(result) << 1) == SAM_STAT_GOOD) { 648 bool read_only = target_lun_is_rdonly(cmd); 649 650 if (read_only) { 651 unsigned char *buf; 652 653 buf = transport_kmap_data_sg(cmd); 654 if (!buf) 655 ; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */ 656 657 if (cdb[0] == MODE_SENSE_10) { 658 if (!(buf[3] & 0x80)) 659 buf[3] |= 0x80; 660 } else { 661 if (!(buf[2] & 0x80)) 662 buf[2] |= 0x80; 663 } 664 665 transport_kunmap_data_sg(cmd); 666 } 667 } 668 after_mode_sense: 669 670 if (sd->type != TYPE_TAPE || !cmd->data_length) 671 goto after_mode_select; 672 673 /* 674 * Hack to correctly obtain the initiator requested blocksize for 675 * TYPE_TAPE. Since this value is dependent upon each tape media, 676 * struct scsi_device->sector_size will not contain the correct value 677 * by default, so we go ahead and set it so 678 * TRANSPORT(dev)->get_blockdev() returns the correct value to the 679 * storage engine. 680 */ 681 if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) && 682 (status_byte(result) << 1) == SAM_STAT_GOOD) { 683 unsigned char *buf; 684 u16 bdl; 685 u32 blocksize; 686 687 buf = sg_virt(&sg[0]); 688 if (!buf) { 689 pr_err("Unable to get buf for scatterlist\n"); 690 goto after_mode_select; 691 } 692 693 if (cdb[0] == MODE_SELECT) 694 bdl = (buf[3]); 695 else 696 bdl = (buf[6] << 8) | (buf[7]); 697 698 if (!bdl) 699 goto after_mode_select; 700 701 if (cdb[0] == MODE_SELECT) 702 blocksize = (buf[9] << 16) | (buf[10] << 8) | 703 (buf[11]); 704 else 705 blocksize = (buf[13] << 16) | (buf[14] << 8) | 706 (buf[15]); 707 708 sd->sector_size = blocksize; 709 } 710 after_mode_select: 711 712 if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) { 713 memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER); 714 cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; 715 } 716 } 717 718 enum { 719 Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id, 720 Opt_scsi_lun_id, Opt_err 721 }; 722 723 static match_table_t tokens = { 724 {Opt_scsi_host_id, "scsi_host_id=%d"}, 725 {Opt_scsi_channel_id, "scsi_channel_id=%d"}, 726 {Opt_scsi_target_id, "scsi_target_id=%d"}, 727 {Opt_scsi_lun_id, "scsi_lun_id=%d"}, 728 {Opt_err, NULL} 729 }; 730 731 static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev, 732 const char *page, ssize_t count) 733 { 734 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 735 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 736 char *orig, *ptr, *opts; 737 substring_t args[MAX_OPT_ARGS]; 738 int ret = 0, arg, token; 739 740 opts = kstrdup(page, GFP_KERNEL); 741 if (!opts) 742 return -ENOMEM; 743 744 orig = opts; 745 746 while ((ptr = strsep(&opts, ",\n")) != NULL) { 747 if (!*ptr) 748 continue; 749 750 token = match_token(ptr, tokens, args); 751 switch (token) { 752 case Opt_scsi_host_id: 753 if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) { 754 pr_err("PSCSI[%d]: Unable to accept" 755 " scsi_host_id while phv_mode ==" 756 " PHV_LLD_SCSI_HOST_NO\n", 757 phv->phv_host_id); 758 ret = -EINVAL; 759 goto out; 760 } 761 ret = match_int(args, &arg); 762 if (ret) 763 goto out; 764 pdv->pdv_host_id = arg; 765 pr_debug("PSCSI[%d]: Referencing SCSI Host ID:" 766 " %d\n", phv->phv_host_id, pdv->pdv_host_id); 767 pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID; 768 break; 769 case Opt_scsi_channel_id: 770 ret = match_int(args, &arg); 771 if (ret) 772 goto out; 773 pdv->pdv_channel_id = arg; 774 pr_debug("PSCSI[%d]: Referencing SCSI Channel" 775 " ID: %d\n", phv->phv_host_id, 776 pdv->pdv_channel_id); 777 pdv->pdv_flags |= PDF_HAS_CHANNEL_ID; 778 break; 779 case Opt_scsi_target_id: 780 ret = match_int(args, &arg); 781 if (ret) 782 goto out; 783 pdv->pdv_target_id = arg; 784 pr_debug("PSCSI[%d]: Referencing SCSI Target" 785 " ID: %d\n", phv->phv_host_id, 786 pdv->pdv_target_id); 787 pdv->pdv_flags |= PDF_HAS_TARGET_ID; 788 break; 789 case Opt_scsi_lun_id: 790 ret = match_int(args, &arg); 791 if (ret) 792 goto out; 793 pdv->pdv_lun_id = arg; 794 pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:" 795 " %d\n", phv->phv_host_id, pdv->pdv_lun_id); 796 pdv->pdv_flags |= PDF_HAS_LUN_ID; 797 break; 798 default: 799 break; 800 } 801 } 802 803 out: 804 kfree(orig); 805 return (!ret) ? count : ret; 806 } 807 808 static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b) 809 { 810 struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr; 811 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 812 struct scsi_device *sd = pdv->pdv_sd; 813 unsigned char host_id[16]; 814 ssize_t bl; 815 int i; 816 817 if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) 818 snprintf(host_id, 16, "%d", pdv->pdv_host_id); 819 else 820 snprintf(host_id, 16, "PHBA Mode"); 821 822 bl = sprintf(b, "SCSI Device Bus Location:" 823 " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n", 824 pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id, 825 host_id); 826 827 if (sd) { 828 bl += sprintf(b + bl, " "); 829 bl += sprintf(b + bl, "Vendor: "); 830 for (i = 0; i < 8; i++) { 831 if (ISPRINT(sd->vendor[i])) /* printable character? */ 832 bl += sprintf(b + bl, "%c", sd->vendor[i]); 833 else 834 bl += sprintf(b + bl, " "); 835 } 836 bl += sprintf(b + bl, " Model: "); 837 for (i = 0; i < 16; i++) { 838 if (ISPRINT(sd->model[i])) /* printable character ? */ 839 bl += sprintf(b + bl, "%c", sd->model[i]); 840 else 841 bl += sprintf(b + bl, " "); 842 } 843 bl += sprintf(b + bl, " Rev: "); 844 for (i = 0; i < 4; i++) { 845 if (ISPRINT(sd->rev[i])) /* printable character ? */ 846 bl += sprintf(b + bl, "%c", sd->rev[i]); 847 else 848 bl += sprintf(b + bl, " "); 849 } 850 bl += sprintf(b + bl, "\n"); 851 } 852 return bl; 853 } 854 855 static void pscsi_bi_endio(struct bio *bio) 856 { 857 bio_put(bio); 858 } 859 860 static inline struct bio *pscsi_get_bio(int nr_vecs) 861 { 862 struct bio *bio; 863 /* 864 * Use bio_malloc() following the comment in for bio -> struct request 865 * in block/blk-core.c:blk_make_request() 866 */ 867 bio = bio_kmalloc(GFP_KERNEL, nr_vecs); 868 if (!bio) { 869 pr_err("PSCSI: bio_kmalloc() failed\n"); 870 return NULL; 871 } 872 bio->bi_end_io = pscsi_bi_endio; 873 874 return bio; 875 } 876 877 static sense_reason_t 878 pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 879 enum dma_data_direction data_direction, struct bio **hbio) 880 { 881 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); 882 struct bio *bio = NULL, *tbio = NULL; 883 struct page *page; 884 struct scatterlist *sg; 885 u32 data_len = cmd->data_length, i, len, bytes, off; 886 int nr_pages = (cmd->data_length + sgl[0].offset + 887 PAGE_SIZE - 1) >> PAGE_SHIFT; 888 int nr_vecs = 0, rc; 889 int rw = (data_direction == DMA_TO_DEVICE); 890 891 *hbio = NULL; 892 893 pr_debug("PSCSI: nr_pages: %d\n", nr_pages); 894 895 for_each_sg(sgl, sg, sgl_nents, i) { 896 page = sg_page(sg); 897 off = sg->offset; 898 len = sg->length; 899 900 pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i, 901 page, len, off); 902 903 /* 904 * We only have one page of data in each sg element, 905 * we can not cross a page boundary. 906 */ 907 if (off + len > PAGE_SIZE) 908 goto fail; 909 910 if (len > 0 && data_len > 0) { 911 bytes = min_t(unsigned int, len, PAGE_SIZE - off); 912 bytes = min(bytes, data_len); 913 914 if (!bio) { 915 nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages); 916 nr_pages -= nr_vecs; 917 /* 918 * Calls bio_kmalloc() and sets bio->bi_end_io() 919 */ 920 bio = pscsi_get_bio(nr_vecs); 921 if (!bio) 922 goto fail; 923 924 if (rw) 925 bio->bi_rw |= REQ_WRITE; 926 927 pr_debug("PSCSI: Allocated bio: %p," 928 " dir: %s nr_vecs: %d\n", bio, 929 (rw) ? "rw" : "r", nr_vecs); 930 /* 931 * Set *hbio pointer to handle the case: 932 * nr_pages > BIO_MAX_PAGES, where additional 933 * bios need to be added to complete a given 934 * command. 935 */ 936 if (!*hbio) 937 *hbio = tbio = bio; 938 else 939 tbio = tbio->bi_next = bio; 940 } 941 942 pr_debug("PSCSI: Calling bio_add_pc_page() i: %d" 943 " bio: %p page: %p len: %d off: %d\n", i, bio, 944 page, len, off); 945 946 rc = bio_add_pc_page(pdv->pdv_sd->request_queue, 947 bio, page, bytes, off); 948 if (rc != bytes) 949 goto fail; 950 951 pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n", 952 bio->bi_vcnt, nr_vecs); 953 954 if (bio->bi_vcnt > nr_vecs) { 955 pr_debug("PSCSI: Reached bio->bi_vcnt max:" 956 " %d i: %d bio: %p, allocating another" 957 " bio\n", bio->bi_vcnt, i, bio); 958 /* 959 * Clear the pointer so that another bio will 960 * be allocated with pscsi_get_bio() above, the 961 * current bio has already been set *tbio and 962 * bio->bi_next. 963 */ 964 bio = NULL; 965 } 966 967 data_len -= bytes; 968 } 969 } 970 971 return 0; 972 fail: 973 while (*hbio) { 974 bio = *hbio; 975 *hbio = (*hbio)->bi_next; 976 bio_endio(bio); 977 } 978 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 979 } 980 981 static sense_reason_t 982 pscsi_parse_cdb(struct se_cmd *cmd) 983 { 984 if (cmd->se_cmd_flags & SCF_BIDI) 985 return TCM_UNSUPPORTED_SCSI_OPCODE; 986 987 return passthrough_parse_cdb(cmd, pscsi_execute_cmd); 988 } 989 990 static sense_reason_t 991 pscsi_execute_cmd(struct se_cmd *cmd) 992 { 993 struct scatterlist *sgl = cmd->t_data_sg; 994 u32 sgl_nents = cmd->t_data_nents; 995 enum dma_data_direction data_direction = cmd->data_direction; 996 struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev); 997 struct pscsi_plugin_task *pt; 998 struct request *req; 999 struct bio *hbio; 1000 sense_reason_t ret; 1001 1002 /* 1003 * Dynamically alloc cdb space, since it may be larger than 1004 * TCM_MAX_COMMAND_SIZE 1005 */ 1006 pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL); 1007 if (!pt) { 1008 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1009 } 1010 cmd->priv = pt; 1011 1012 memcpy(pt->pscsi_cdb, cmd->t_task_cdb, 1013 scsi_command_size(cmd->t_task_cdb)); 1014 1015 if (!sgl) { 1016 req = blk_get_request(pdv->pdv_sd->request_queue, 1017 (data_direction == DMA_TO_DEVICE), 1018 GFP_KERNEL); 1019 if (IS_ERR(req)) { 1020 pr_err("PSCSI: blk_get_request() failed\n"); 1021 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1022 goto fail; 1023 } 1024 1025 blk_rq_set_block_pc(req); 1026 } else { 1027 BUG_ON(!cmd->data_length); 1028 1029 ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio); 1030 if (ret) 1031 goto fail; 1032 1033 req = blk_make_request(pdv->pdv_sd->request_queue, hbio, 1034 GFP_KERNEL); 1035 if (IS_ERR(req)) { 1036 pr_err("pSCSI: blk_make_request() failed\n"); 1037 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1038 goto fail_free_bio; 1039 } 1040 } 1041 1042 req->end_io = pscsi_req_done; 1043 req->end_io_data = cmd; 1044 req->cmd_len = scsi_command_size(pt->pscsi_cdb); 1045 req->cmd = &pt->pscsi_cdb[0]; 1046 req->sense = &pt->pscsi_sense[0]; 1047 req->sense_len = 0; 1048 if (pdv->pdv_sd->type == TYPE_DISK) 1049 req->timeout = PS_TIMEOUT_DISK; 1050 else 1051 req->timeout = PS_TIMEOUT_OTHER; 1052 req->retries = PS_RETRY; 1053 1054 blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req, 1055 (cmd->sam_task_attr == TCM_HEAD_TAG), 1056 pscsi_req_done); 1057 1058 return 0; 1059 1060 fail_free_bio: 1061 while (hbio) { 1062 struct bio *bio = hbio; 1063 hbio = hbio->bi_next; 1064 bio_endio(bio); 1065 } 1066 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 1067 fail: 1068 kfree(pt); 1069 return ret; 1070 } 1071 1072 /* pscsi_get_device_type(): 1073 * 1074 * 1075 */ 1076 static u32 pscsi_get_device_type(struct se_device *dev) 1077 { 1078 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 1079 struct scsi_device *sd = pdv->pdv_sd; 1080 1081 return (sd) ? sd->type : TYPE_NO_LUN; 1082 } 1083 1084 static sector_t pscsi_get_blocks(struct se_device *dev) 1085 { 1086 struct pscsi_dev_virt *pdv = PSCSI_DEV(dev); 1087 1088 if (pdv->pdv_bd && pdv->pdv_bd->bd_part) 1089 return pdv->pdv_bd->bd_part->nr_sects; 1090 1091 dump_stack(); 1092 return 0; 1093 } 1094 1095 static void pscsi_req_done(struct request *req, int uptodate) 1096 { 1097 struct se_cmd *cmd = req->end_io_data; 1098 struct pscsi_plugin_task *pt = cmd->priv; 1099 1100 pt->pscsi_result = req->errors; 1101 pt->pscsi_resid = req->resid_len; 1102 1103 cmd->scsi_status = status_byte(pt->pscsi_result) << 1; 1104 if (cmd->scsi_status) { 1105 pr_debug("PSCSI Status Byte exception at cmd: %p CDB:" 1106 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0], 1107 pt->pscsi_result); 1108 } 1109 1110 switch (host_byte(pt->pscsi_result)) { 1111 case DID_OK: 1112 target_complete_cmd(cmd, cmd->scsi_status); 1113 break; 1114 default: 1115 pr_debug("PSCSI Host Byte exception at cmd: %p CDB:" 1116 " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0], 1117 pt->pscsi_result); 1118 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 1119 break; 1120 } 1121 1122 __blk_put_request(req->q, req); 1123 kfree(pt); 1124 } 1125 1126 static const struct target_backend_ops pscsi_ops = { 1127 .name = "pscsi", 1128 .owner = THIS_MODULE, 1129 .transport_flags = TRANSPORT_FLAG_PASSTHROUGH, 1130 .attach_hba = pscsi_attach_hba, 1131 .detach_hba = pscsi_detach_hba, 1132 .pmode_enable_hba = pscsi_pmode_enable_hba, 1133 .alloc_device = pscsi_alloc_device, 1134 .configure_device = pscsi_configure_device, 1135 .free_device = pscsi_free_device, 1136 .transport_complete = pscsi_transport_complete, 1137 .parse_cdb = pscsi_parse_cdb, 1138 .set_configfs_dev_params = pscsi_set_configfs_dev_params, 1139 .show_configfs_dev_params = pscsi_show_configfs_dev_params, 1140 .get_device_type = pscsi_get_device_type, 1141 .get_blocks = pscsi_get_blocks, 1142 .tb_dev_attrib_attrs = passthrough_attrib_attrs, 1143 }; 1144 1145 static int __init pscsi_module_init(void) 1146 { 1147 return transport_backend_register(&pscsi_ops); 1148 } 1149 1150 static void __exit pscsi_module_exit(void) 1151 { 1152 target_backend_unregister(&pscsi_ops); 1153 } 1154 1155 MODULE_DESCRIPTION("TCM PSCSI subsystem plugin"); 1156 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 1157 MODULE_LICENSE("GPL"); 1158 1159 module_init(pscsi_module_init); 1160 module_exit(pscsi_module_exit); 1161